package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.metadata.OrderItem;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.OrderMapper;
import com.sky.result.PageResult;
import com.sky.service.*;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.RequiredArgsConstructor;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@RequiredArgsConstructor
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    private final OrderDetailService orderDetailService;
    private final AddressBookService addressBookService;
    private final ShoppingCartService shoppingCartService;

    private final UserService userService;

    @Autowired
    private WebSocketServer webSocketServer;

    @Autowired
    private WeChatPayUtil weChatPayUtil;

    /**
     * 用户下单
     * @param orderSubmitDTO
     * @return
     */
    @Override
    @Transactional  //实现方法,哪里操作数据库哪里加事物注解
    public OrderSubmitVO submitOrder(OrdersSubmitDTO orderSubmitDTO) {
        //处理各类异常（地址为空，购物车数据为空）
        AddressBook addressBook = addressBookService.getById(orderSubmitDTO.getAddressBookId());
        if(addressBook == null){
            //抛出业务异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        //查询购物车数据
        Long userId = BaseContext.getCurrentId();
        List<ShoppingCart> shoppingCarts = shoppingCartService.lambdaQuery().eq(ShoppingCart::getUserId, userId).list();
        if(shoppingCarts == null || shoppingCarts.size() ==0){
            //抛出业务异常
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //向订单表插入一条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(orderSubmitDTO,orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(userId);

        save(orders);//插入之后生成id

        Long id = orders.getId();//能不能直接查id? 测试过，插入后，直接返回id，可以直接查id

        List<OrderDetail> orderDetailList = new ArrayList<>();
        //向订单明细表插入n条数据
        for (ShoppingCart shoppingCart : shoppingCarts) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(shoppingCart,orderDetail);
            //获取新插入订单表的id值,能不能直接查? 能
            Orders orders1 = getById(orders);
            orderDetail.setOrderId(orders1.getId());
            orderDetailList.add(orderDetail);
        }
        //批量插入
        orderDetailService.saveBatch(orderDetailList);
        //清空购物车数据
        shoppingCartService.removeBatchByIds(shoppingCarts);
        //封装VO返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount()).build();

        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    //设置默认值，跳过支付方法
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userService.getById(userId);

//        //调用微信支付接口，生成预支付交易单
//        JSONObject jsonObject = weChatPayUtil.pay(
//                ordersPaymentDTO.getOrderNumber(), //商户订单号
//                new BigDecimal(0.01), //支付金额，单位 元
//                "苍穹外卖订单", //商品描述
//                user.getOpenid() //微信用户的openid
//        );

        //生成新的 jsonObject，跳过支付流程
        JSONObject jsonObject = new JSONObject();

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }
        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {
        // 根据订单号查询订单
        Orders ordersDB = lambdaQuery().eq(Orders::getNumber, outTradeNo).one();
//
//        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
//        Orders orders = Orders.builder()
//                .id(ordersDB.getId())
//                .status(Orders.TO_BE_CONFIRMED)
//                .payStatus(Orders.PAID)
//                .checkoutTime(LocalDateTime.now())
//                .build();
//
//        updateById(orders);

        //也可以用下面的函数表达式
        lambdaUpdate()
                .set(Orders::getStatus, Orders.TO_BE_CONFIRMED)
                .set(Orders::getPayStatus, Orders.PAID)
                .set(Orders::getCheckoutTime, LocalDateTime.now())
                .eq(Orders::getNumber, outTradeNo).update();

        //通过websocket向客户端游览器推送消息 type orderId content
        Map map =new HashMap();
        map.put("type",1);
        map.put("orderId",ordersDB.getId());
        map.put("content","订单号:" + outTradeNo);

        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /**
     * 订单搜索
     *
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        String number = ordersPageQueryDTO.getNumber();
        String phone = ordersPageQueryDTO.getPhone();
        Long userId = ordersPageQueryDTO.getUserId();
        Integer status = ordersPageQueryDTO.getStatus();
        LocalDateTime beginTime = ordersPageQueryDTO.getBeginTime();
        LocalDateTime endTime = ordersPageQueryDTO.getEndTime();

        Page<Orders> pageCondition = Page.of(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());

        //排序条件
        pageCondition.addOrder(new OrderItem("order_Time",false));

        //返回的订单对象要和输入的对象一一匹配，根据订单号一一匹配 ?
        Page<Orders> page = lambdaQuery()
                .like(number != null ,Orders::getNumber, number)
                .like(phone != null ,Orders::getPhone, phone)
                .eq(userId != null ,Orders::getUserId, userId)
                .eq(status != null ,Orders::getStatus, status)
                .gt(beginTime != null ,Orders::getOrderTime, beginTime)//大于
                .lt(number != null ,Orders::getOrderTime, number)//小于
                .page(pageCondition);

        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(), orderVOList);
    }


    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getRecords();
//        List<Orders> ordersList = page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)) {
            for (Orders orders : ordersList) {
                // 将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishesStr(orders);

                // 将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    /**
     * 根据订单id获取菜品信息字符串
     *
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailService.lambdaQuery().eq(OrderDetail::getOrderId, orders.getId()).list();
//        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }


    /**
     * 历史订单查询
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    //TODO 仔细看看
    @Override
    public PageResult pageQuery(int pageNum, int pageSize, Integer status) {
        Long userId = BaseContext.getCurrentId();
        //分页条件
        Page<Orders> pageCondition = Page.of(pageNum, pageSize);

//        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
//        ordersPageQueryDTO.setUserId(userId);
//        ordersPageQueryDTO.setStatus(status);

        //排序条件
        pageCondition.addOrder(new OrderItem("order_Time",false));

        //返回的订单对象要和输入的对象一一匹配，根据订单号一一匹配 ?
        Page<Orders> page = lambdaQuery()
                .eq(Orders::getUserId, userId)
                .eq(status != null, Orders::getStatus, status)
                .page(pageCondition);

        //得到集合
        List<Orders> records = page.getRecords();

        // 查询出订单明细，并封装入OrderVO进行响应
        List<OrderVO> list = new ArrayList();
        if (records != null && records.size() > 0) {
            for (Orders orders : records) {
                Long orderId = orders.getId();// 订单id
                // 查询订单明细
                List<OrderDetail> orderDetails = orderDetailService.lambdaQuery().eq(OrderDetail::getOrderId, orderId).list();
//                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);

                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetails);

                list.add(orderVO);
            }
        }
        return new PageResult(page.getTotal(), list);
    }

    /**
     * 拒单
     *
     * @param ordersRejectionDTO
     */
    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception{
        // 根据id查询订单
        Orders ordersDB = getById(ordersRejectionDTO.getId());

        // 订单只有存在且状态为2（待接单）才可以拒单
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

//        //支付状态
//        Integer payStatus = ordersDB.getPayStatus();
//        if (payStatus == Orders.PAID) {
//            //用户已支付，需要退款
//            String refund = weChatPayUtil.refund(
//                    ordersDB.getNumber(),
//                    ordersDB.getNumber(),
//                    new BigDecimal(0.01),
//                    new BigDecimal(0.01));
//            log.info("申请退款：{}", refund);
//        }

        // 拒单需要退款，根据订单id更新订单状态、拒单原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());

        updateById(orders);
    }

    /**
     * 取消订单
     *
     * @param ordersCancelDTO
     */
    public void cancel(OrdersCancelDTO ordersCancelDTO) throws Exception {
        // 根据id查询订单
        Orders ordersDB = getById(ordersCancelDTO.getId());

//        //支付状态
//        Integer payStatus = ordersDB.getPayStatus();
//        if (payStatus == 1) {
//            //用户已支付，需要退款
//            String refund = weChatPayUtil.refund(
//                    ordersDB.getNumber(),
//                    ordersDB.getNumber(),
//                    new BigDecimal(0.01),
//                    new BigDecimal(0.01));
//            log.info("申请退款：{}", refund);
//        }

        // 管理端取消订单需要退款，根据订单id更新订单状态、取消原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersCancelDTO.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason(ordersCancelDTO.getCancelReason());
        orders.setCancelTime(LocalDateTime.now());
        updateById(orders);
    }

    /**
     * 派送订单
     *
     * @param id
     */
    public void delivery(Long id) {
        // 根据id查询订单
        Orders ordersDB = getById(id);

        // 校验订单是否存在，并且状态为3
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为派送中
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);

        updateById(orders);
    }

    /**
     * 完成订单
     *
     * @param id
     */
    public void complete(Long id) {
        // 根据id查询订单
        Orders ordersDB = getById(id);

        // 校验订单是否存在，并且状态为4
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为完成
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());

        updateById(orders);
    }

}
